I seriously dont know, my PS4 is a dust collector because of the lack of fun games and I play my Wii U daily because of the fun games it has. The lack of a really good internet infrastructure, generic shooters and so called "mature" content would be my guess as to why it doesnt sell as much as it's competitor. Oh and also the lack of advertisement, the name and probably the gamepad (as awesome as it is)
Hopefully Nintendo has something up their sleeve, and hopefully the games they arent talking about to be released on the console is a huge third party game.







